6
6.0
Jul 14, 2015
07/15
Jul 14, 2015
by
William H. Butler; Claudia K. A. Mewes; Chunsheng Liu; Tianyi Xu
6
0
1
We present a rational approach to the design of halfmetallic heterostructures which allows the design of an infinite number of halfmetallic heterostructures. The wide range of materials that can be made halfmetallic using our approach makes it possible to engineer materials with tunable characteristic properties, for example low intrinsic magnetic damping, small magnetic moment or perpendicular anisotropy. We demonstrate the proposed design scheme for a series of transition metal...
( 1 reviews )
Source: http://arxiv.org/abs/1103.3855v1
13
13
Apr 8, 2015
04/15
Apr 8, 2015
by
S. AraujoBetancor; B. T. Gaensicke; K. S. Long; K. Beuermann; D. de Martino; E. M. Sion; P. Szkody
13
0
1
We have obtained HST/STIS data for a total of eleven polars as part of a program aimed to compile a homogeneous database of highquality farultraviolet (FUV) spectra for a large number of cataclysmic variables (CVs). Of the eleven polars, eight were found in a state of low accretion activity (V347Pav, VVPup, V834Cen, BLHyi, MRSer, STLMi, RXJ1554.2+2721 and V895Cen) and three in a state of high activity (CDInd, ANUMa and UWPic). The STIS spectra of the lowstate polars unambiguously reveal the...
( 1 reviews )
Source: http://arxiv.org/abs/astroph/0412180v1
21
21
Apr 8, 2015
04/15
Apr 8, 2015
by
Michael L. Sitko; Lawrence S. Bernstein; Robert J. Glinski
21
0
1
We have reanalyzed the ultraviolet spectrum of HD 44179, the central star(s) of the Red Rectangle nebula, providing improved estimates of the column density, rotational, and vibrational temperatures of the 4th Positive AX system of CO in absorption. The flux shortward of 2200 A is a complex blend of CO features with no discernible stellar photosphere, making the identification of other molecular species difficult, and the direct derivation of the dust extinction curve impossible. We confirm...
( 1 reviews )
Source: http://arxiv.org/abs/0802.2085v1
38
38
Mar 15, 2015
03/15
Mar 15, 2015
by
Mikhail I. Rabinovich; Mehmet K. Muezzinoglu
38
0
1
We present a new paradigm in the study of brain mental dynamics on the basis of the stable transient activity neural networks observed in experiments. This new approach is in contrast to traditional system analysis usually adopted in cognitive modeling. Transient dynamics offers a sound formalism of the observed qualities of brain activity, while providing a rigorous set of analysis tools. Transients have two main features: First, they are resistant to noise, and reliable even in the face of...
( 1 reviews )
Source: http://arxiv.org/abs/0909.1144v1
32
32
Jan 26, 2015
01/15
Jan 26, 2015
by
Arkaitz Zubiaga; Damiano Spina; Enrique Amigó; Julio Gonzalo
32
0
1
This paper explores the realtime summarization of scheduled events such as soccer games from torrential flows of Twitter streams. We propose and evaluate an approach that substantially shrinks the stream of tweets in realtime, and consists of two steps: (i) subevent detection, which determines if something new has occurred, and (ii) tweet selection, which picks a representative tweet to describe each subevent. We compare the summaries generated in three languages for all the soccer games in...
( 1 reviews )
Source: http://arxiv.org/abs/1204.3731v1
100
100
Mar 28, 2014
03/14
Mar 28, 2014
by
J. L. F. Barbon
100
1
1
This is a rendering of a review talk on the state of String Theory, given at the EPS2003 Conference, intended for a wide audience of experimental and theoretical physicists. It emphasizes general ideas rather than technical aspects.
( 1 reviews )
Source: http://arxiv.org/abs/hepth/0404188v1
59
59
Mar 2, 2014
03/14
Mar 2, 2014
by
Roman Sverdlov
59
0
1
The first goal of this paper is to show that discreteness, locality, and relativistic covariance can peacefully coexist if the ordinary spacetime (OST) is replaced with phase spacetime (PST) as a geometric background of a Poisson process, where PST is a spacetime generalization of a notion of phase space (this is a 7dimensional version of the 8dimensional structure proposed by Caianiello). Furthermore, Caianiello's idea of finite acceleration is implemented. After this is done, the paper then...
( 1 reviews )
Source: http://arxiv.org/abs/0910.2498v3
44
44
Nov 7, 2013
11/13
Nov 7, 2013
by
Andrei A. Galiautdinov; David R. Finkelstein
44
0
1
The Dirac equation is not semisimple. We therefore regard it as a contraction of a simpler decontracted theory. The decontracted theory is necessarily purely algebraic and nonlocal. In one simple model the algebra is a Clifford algebra with 6N generators. The quantum imaginary $\hbar i$ is the contraction of a dynamical variable whose backreaction provides the Dirac mass. The simplified Dirac equation is exactly Lorentz invariant but its symmetry group is SO(3,3), a decontraction of the...
( 1 reviews )
Source: http://arxiv.org/abs/hepth/0106273v2
10
10.0



by
Leo Radzihovsky; Tom Lubensky
10
0
0
Motivated in part by recent experiments on liquid crystals with bentcore molecules, which are observed to display a spontaneous chiral symmetry breaking, we introduce a field theory of a 3rdrank tensor order parameter T^{ijk} to describe the isotropictotetrahedratic phase transition that we predict to take place in these materials. We study the critical properties of the corresponding phase transition and find that this transition, continuous at the meanfield level, is generically driven...
Source: http://arxiv.org/abs/condmat/0008325v1
9
9.0



by
Fabrice Durier; Claudio Dalla Vecchia
9
0
0
We perform simulations of feedback from supernovae and black holes with smoothed particle hydrodynamics (SPH). Such strong perturbations are inaccurately handled with standard time integration schemes, leading to poor energy conservation, a problem that is commonly overlooked. We show for the first time that, in the absence of radiative cooling, concordance of thermal and kinetic feedback are achieved when using an accurate time integration. In order to preserve the concordance of feedback...
Source: http://arxiv.org/abs/1105.3729v2
28
28



by
G. Brooijmans; A. Delgado; B. A. Dobrescu; C. Grojean; M. Narain; J. Alwall; G. Azuelos; K. Black; E. Boos; T. Bose; V. Bunichev; R. S. Chivukula; R. Contino; A. Djouadi; L. Dudko; J. Ferland; Y. Gershtein; M. Gigg; S. Gonzalez de la Hoz; M. Herquet; J. Hirn; G. Landsberg; K. Lane; E. Maina; L. March; A. Martin; X. Miao; G. Moreau; M. M. Nojiri; A. Pukhov; P. Ribeiro; P. Richardson; E. Ros; R. Rosenfeld; J. Santiago; V. Sanz; H. J. Schreiber; G. Servant; A. Sherstnev; E. H. Simmons; R. K. Singh; P. Skands; S. Su; T. M. P. Tait; M. Takeuchi; M. Vos; D. G. E. Walker
28
0
0
We present a collection of signatures for physics beyond the standard model that need to be explored at the LHC. The signatures are organized according to the experimental objects that appear in the final state, and in particular the number of high pT leptons. Our report, which includes brief experimental and theoretical reviews as well as original results, summarizes the activities of the "New Physics'' working group for the "Physics at TeV Colliders" workshop (Les Houches,...
Source: http://arxiv.org/abs/0802.3715v1
7
7.0



by
A. Bazavov; C. Bernard; C. DeTar; W. Freeman; Steven Gottlieb; U. M. Heller; J. E. Hetrick; J. Laiho; L. Levkova; J. Osborn; R. Sugar; D. Toussaint
7
0
0
We report on recent progress in employing the Highly Improved Staggered Quark (HISQ) action introduced by the HPQCD/UKQCD collaboration in simulations with dynamical fermions. The HISQ action is an order $a^2$ Symanzikimproved action with further suppressed taste symmetry violations. The improvement in taste symmetry is achieved by introducing Fat7 smearing of the original gauge links and reunitarization (projection to an element of U(3) or SU(3)) followed by Asqtype smearing. Major...
Source: http://arxiv.org/abs/0903.0874v1
This paper is addressed to a study of the null controllability for the semilinear parabolic equation with a complex principal part. For this purpose, we establish a key weighted identity for partial differential operators $(\a+i\b)\pa_t+\sum\limits_{j,k=1}^n\pa_k(a^{jk}\pa_j)$ (with real functions $\a$ and $\b$), by which we develop a universal approach, based on global Carleman estimate, to deduce not only the desired explicit observability estimate for the linearized complex GinzburgLandau...
Source: http://arxiv.org/abs/0805.3808v1
7
7.0



by
Zoltan Fodor; Kieran Holland; Julius Kuti; Daniel Nogradi; Chris Schroeder
7
0
0
SU(3) gauge theory with dynamical overlap fermions in the 2index symmetric (sextet) representation is considered. This model may be a viable model of the electroweak symmetry breaking sector along the lines of the walking technicolor paradigm. The number of fermion species is chosen such that the theory is expected to be below the conformal window. We will discuss how the epsilonregime and random matrix theory can be used to test whether at any given set of parameters (N_c, N_f,...
Source: http://arxiv.org/abs/0809.4888v1
We investigate the dynamical correlation function of a quantummechanical twostate system which is coupled to a bosonic heat bath, utilizing the equivalence between the spinboson Hamiltonian and the 1/r^2 Ising model. The imaginarytime correlation function is calculated by MonteCarlo simulations on the Ising system and then continued to real time by a Pade approximation. In the unbiased system, the transition from oscillatory to strongly damped behavior is found to occur at a coupling...
Source: http://arxiv.org/abs/condmat/9712080v3
11
11



by
David A. Quint; Ajay Gopinathan
11
0
0
The emergence of collective motion, also known as flocking or swarming, in groups of moving individuals who orient themselves using only information from their neighbors is a very general phenomenon that is manifested at multiple spatial and temporal scales. Swarms that occur in natural environments typically have to contend with spatial disorder such as obstacles that hinder an individual's motion or communication with neighbors. We study swarming particles, with both aligning and repulsive...
Source: http://arxiv.org/abs/1302.6564v1
A phasespace anisotropic operator in H=L^2(R^n) is a selfadjoint operator whose resolvent family belongs to a natural C*completion of the space of H\"ormander symbols of order zero. Equivalently, each member of the resolvent family is normcontinuous under conjugation with the Schr\"odinger unitary representation of the Heisenberg group. The essential spectrum of such a phasespace anisotropic operator is the closure of the union of usual spectra of all its "phasespace...
Source: http://arxiv.org/abs/1106.2461v3
The flux of neutrinoinduced muons at the surface of the Earth is calculated from injection of neutralino annihilation products in the core of the Sun and the Earth. An improved treatment of neutrino propagation through the Sun is performed and the results are presented in an easytouse parameterization. For an explicit supersymmetric model, an observable neutralino annihilation signal is demonstrated.
Source: http://arxiv.org/abs/hepph/9504205v1
We construct from first principles the operator 'Ahat' that annihilates the partition functions (or wavefunctions) of threedimensional ChernSimons theory with gauge groups SU(2), SL(2,R), or SL(2,C) on a knot complement M. The operator 'Ahat' is a quantization of the knot complement's classical Apolynomial A(l,m). The construction proceeds by decomposing threemanifolds into ideal tetrahedra, and invoking a new, more global understanding of gluing in TQFT to put them back together. We...
Source: http://arxiv.org/abs/1102.4847v3
6
6.0



by
L. J. Hall; G. G. Ross
6
0
0
The recent measurement of the third lepton mixing angle, \theta_{13}, has shown that, although small compared to \theta_{12} and \theta_{23}, it is much larger than anticipated in schemes that generate TriBiMaximal (TBM) or Golden Ratio (GR) mixing. We develop a modelindependent formalism for perturbations away from exact TBM or GR mixing in the neutrino sector. Each resulting perturbation scheme reflects an underlying symmetry structure and involves a single complex parameter. We show that...
Source: http://arxiv.org/abs/1303.6962v1
12
12



by
Zs. Kővári; A. Washuettl; B. H. Foing; K. Vida; J. Bartus; K. Oláh; the MUSICOS 98 team
12
0
0
We present timeseries Doppler images of the rapidlyrotating active binary star EI Eri from spectroscopic observations collected during the MUSICOS multisite campaign in 1998, since the critical rotation period of 1.947 days makes it impossible to obtain timeresolved images from a single site. From the surface reconstructions a weak solartype differential rotation, as well as a tiny poleward meridional flow are measured.
Source: http://arxiv.org/abs/0811.0348v1
12
12



by
FuGuo Deng; ChunYan Li; YanSong Li; HongYu Zhou; Yan Wang
12
0
0
We present a way for symmetric multipartycontrolled teleportation of an arbitrary twoparticle entangled state based on Bellbasis measurements by using two GreenbergerHorneZeilinger states, i.e., a sender transmits an arbitrary twoparticle entangled state to a distant receiver, an arbitrary one of the $n+1$ agents via the control of the others in a network. It will be shown that the outcomes in the cases that $n$ is odd or it is even are different in principle as the receiver has to...
Source: http://arxiv.org/abs/quantph/0501129v3
14
14



by
BRAHMS Collaboration; I. G. Bearden
14
0
0
We have measured rapidity densities dN/dy of pions and kaons over a broad rapidity range (0.1 < y < 3.5) for central Au+Au collisions at sqrt(snn) = 200 GeV. These data have significant implications for the chemistry and dynamics of the dense system that is initially created in the collisions. The full phasespace yields are 1660 +/ 15 +/ 133 (pi+), 1683 +/ 16 +/ 135 (pi), 286 +/ 5 +/ 23 (K+) and 242 +/ 4 +/ 19 (K). The systematics of the strange to nonstrange meson ratios...
Source: http://arxiv.org/abs/nuclex/0403050v2
10
10.0



by
F. Dutka; M. Napiorkowski; S. Dietrich
10
0
0
If the constituent particles of fluid phases interact via longranged van der Waals forces, the effective Hamiltonian for \emph{interfaces} between such fluid phases contains  in lateral Fourier space  nonanalytic terms $ \sim q^4 \ln q$. Similar nonanalytic terms characterize the effective Hamiltonian for two interacting interfaces which can emerge between the three possible coexisting fluid phases in binary liquid mixtures. This is in contrast with the structure of the phenomenological...
Source: http://arxiv.org/abs/0805.1146v1
5
5.0



by
M. SantiagoCortes; Y. D. Mayya; D. RosaGonzalez
5
0
0
We study the population of compact stellar clusters (CSCs) in M81, using the HST/ACS images in the filters F435W, F606W and F814W covering, for the first time, the entire optical extent of the galaxy. Our sample contains 435 clusters of FWHM less than 10 ACS pixels (9 pc). The sample shows the presence of two cluster populations, a blue group of 263 objects brighter than B=22 mag, and a red group of 172 objects, brighter than B=24 mag. Based on the analysis of colour magnitude diagrams and...
Source: http://arxiv.org/abs/1002.3370v1
6
6.0



by
T. Susaki; Y. Kozuka; Y. Tateyama; H. Y. Hwang
6
0
0
We have observed temperaturedependent reversal of the rectifying polarity in Au/Nb:SrTiO3 Schottky junctions. By simulating currentvoltage characteristics we have found that the permittivity of SrTiO3 near the interface exhibits temperature dependence opposite to that observed in the bulk, significantly reducing the barrier width. At low temperature, tunneling current dominates the junction transport due both to such barrier narrowing and to suppressed thermal excitations. The present results...
Source: http://arxiv.org/abs/0708.3725v1
10
10.0



by
J. J. M. in 't Zand; J. Swank; R. H. D. Corbet; C. B. Markwardt
10
0
0
A search for pulsations from the Be Xray binary SAX J2239.3+6116, through observations with the Narrow Field Instruments on BeppoSAX and the Proportional Counter Array on RXTE, yielded the clear presence of a 1247 s coherent oscillation. Given the fairly high Xray luminosity on previous occasions (up to a few times 10^36 erg/s in 2 to 28 keV), the oscillation must be due to the spin of a neutron star. Assuming that the 262 day recurrence time is the orbital period, SAX J2239.3+6116 has both...
Source: http://arxiv.org/abs/astroph/0110695v1
9
9.0



by
Quentin Mason; Howard D. Trottier; Ron Horgan; Christine T. H. Davies; G. Peter Lepage
9
0
0
Threeflavor lattice QCD simulations and twoloop perturbation theory are used to make the most precise determination to date of the strange, up, and downquark masses, $m_s$, $m_u$, and $m_d$, respectively. Perturbative matching is required in order to connect the latticeregularized bare quark masses to the masses as defined in the \msbar scheme, and this is done here for the first time at nexttonextto leading (or twoloop) order. The barequark masses required as input come from...
Source: http://arxiv.org/abs/hepph/0511160v1
We derive, from first principle, the FokkerPlanck equation describing the nonperturbative realtime evolution of a gauge field at high temperatures on the spatial scale $(g^2T)^{1}$ and the time scale $(g^4T)^{1}$, where $g$ is the gauge coupling and $T$ is the temperature. The knowledge of the effective dynamics on such spatial and time scales is crucial for the understanding and quantitative calculation of the baryon number violation rate at high temperatures in the electroweak theory....
Source: http://arxiv.org/abs/hepph/9707351v1
Elliott Lieb's icetype models opened up the whole field of solvable models in statistical mechanics. Here we discuss the ``commuting transfer matrix'' $T, Q$ equations for these models, writing them in a more explicit and transparent notation that we believe offers new insights. The approach manifests the relationship between the sixvertex and chiral Potts models, and between the eightvertex and KashiwaraMiwa models.
Source: http://arxiv.org/abs/condmat/0403138v1
8
8.0



by
Arunima Banerjee; Chanda J. Jog
8
0
0
Some low surface brightness galaxies are known to have extremely thin stellar disks with the vertical to planar axes ratio 0.1 or less, often referred to as superthin disks. Although their existence is known for over three decades, the physical origin for the thin distribution is not understood. We model the stellar thickness for a twocomponent (gravitationally coupled stars and gas) disk embedded in a dark matter halo, for a superthin galaxy UGC 7321 which has a dense, compact halo, and...
Source: http://arxiv.org/abs/1210.8244v1
16
16



by
Charles D. Brummitt; Raissa M. D'Souza; E. A. Leicht
16
0
0
Understanding how interdependence among systems affects cascading behaviors is increasingly important across many fields of science and engineering.Inspired by cascades of load shedding in coupled electric grids and other infrastructure, we study the BakTangWiesenfeld sandpile model on modular random graphs and on graphs based on actual, interdependent power grids. Starting from two isolated networks, adding some connectivity between them is beneficial, for it suppresses the largest cascades...
Source: http://arxiv.org/abs/1106.4499v2
11
11



by
R. A. M. J. Wijers; T. J. Galama
11
0
0
We have calculated synchrotron spectra of relativistic blast waves, and find predicted characteristic frequencies that are more than an order of magnitude different from previous calculations. For the case of an adiabatically expanding blast wave, which is applicable to observed gammaray burst (GRB) afterglows at late times, we give expressions to infer the physical properties of the afterglow from the measured spectral features. We show that enough data exist for GRB970508 to compute...
Source: http://arxiv.org/abs/astroph/9805341v2
We make explict a description in terms of convex geometry of the higher Bruhat orders B(n,d) sketched by Kapranov and Voevodsky. We give an analogous description of the higher StasheffTamari poset S_1(n,d). We show that the map f sketched by Kapranov and Voevodsky from B(n,d) to S([0,n+1],d+1) coincides with the map constructed by Rambau, and is a surjection for d
Source: http://arxiv.org/abs/math/0212097v2
The astronomical dark matter could be made of weakly interacting massive species whose mutual annihilations should produce antimatter particles and distortions in the corresponding energy spectra. The propagation of cosmic rays inside the Milky Way plays a crucial role and is briefly presented. The uncertainties in its description lead to considerable variations in the predicted primary fluxes. This point is illustrated with antiprotons. Finally, the various forthcoming projects are rapidly...
Source: http://arxiv.org/abs/astroph/0601602v1
6
6.0



by
Michael H. Albert; Robert Brignall; Vincent Vatter
6
0
0
Infinite antichains of permutations have long been used to construct interesting permutation classes and counterexamples. We prove the existence and detail the construction of infinite antichains with arbitrarily large growth rates. As a consequence, we show that every proper permutation class is contained in a class with a rational generating function. While this result implies the conclusion of the MarcusTardos theorem, that theorem is used in our proof.
Source: http://arxiv.org/abs/1212.3346v2
12
12



by
Constantin R. Simovski; Sailing He
12
0
0
An analytical model is presented for a rectangular lattice of isotropic scatterers with electric and magnetic resonances. Each isotropic scatterer is formed by putting appropriately 6 $\Omega$shaped perfectly conducting particles on the faces of a cubic unit cell. A selfconsistent dispersion equation is derived and then used to calculate correctly the effective permittivity and permeability in the frequency band where the lattice can be homogenized. The frequency range in which both the...
Source: http://arxiv.org/abs/physics/0210049v1
7
7.0



by
Mohsen Alishahiha; Eva Silverstein; David Tong
7
0
0
We analyze the spectrum of density perturbations generated in models of the recently discovered "Dcceleration" mechanism of inflation. In this scenario, strong coupling quantum field theoretic effects sum to provide a DBIlike action for the inflaton. We show that the model has a strict lower bound on the nonGaussianity of the CMBR power spectrum at an observable level, and is thus falsifiable. This in particular observationally distinguishes this mechanism from traditional slow...
Source: http://arxiv.org/abs/hepth/0404084v4
We investigate a possible unified theory of all interactions which is based only on fundamental spinor fields. The vielbein and metric arise as composite objects. The effective quantum gravitational theory can lead to a modification of Einstein's equations due to the lack of local Lorentzsymmetry. We explore the generalized gravity with global instead of local Lorentz symmetry in first order of a systematic derivative expansion. At this level diffeomorphisms and global Lorentz symmetry allow...
Source: http://arxiv.org/abs/hepth/0307145v3
XMMNewton EPIC observations reveal the population of Xray sources of the bright Local Group spiral galaxy M 31, a lowstarformationrate galaxy like the Milky Way, down to a 0.24.5 keV luminosity of 4.4E34 erg/s. With the help of Xray hardness ratios and optical and radio information different source classes can be distinguished. The survey detected 856 sources in an area of 1.24 square degrees. Sources within M 31 are 44 supernova remnants (SNR) and candidates, 18 supersoft sources...
Source: http://arxiv.org/abs/astroph/0511022v1
11
11



by
J. E. Prieto; E. Korutcheva; I. Markov
11
0
0
Quantum dots have promising properties for optoelectronic applications. They can be grown free of dislocations in highly mismatched epitaxy in the coherent StranskiKrastanov mode. In this chapter, some thermodynamic aspects related to the wetting in the growth and selfassembly of threedimensional (3D) coherent islands are studied using an energy minimization scheme in a 1+1dimensional atomic model with anharmonic interactions. The conditions for equilibrium between the different phases are...
Source: http://arxiv.org/abs/condmat/0404673v2
We present stateoftheart electronic structure calculations for the Co$_2$MnSn fullHeusler alloy. We show that in its bulk form it is a halfmetallic ferromagnet with the Fermi level being located within a tiny gap of the minorityspin density of states. Moreover the alloy shows the SlaterPauling behavior with a total spin magnetic moment in the unit cell of 5 $\mu_B$. In the case of the (001) surfaces, the broken bonds at the surface form a minority band pinned exactly at the Fermi level...
Source: http://arxiv.org/abs/0707.0941v1
We study the semileptonic decays B > Xs e+ e, B > Xs mu+ mu in generic supersymmetric extensions of the Standard Model. SUSY effects are parameterized using the mass insertion approximation formalism and differences with MSSM results are pointed out. Constraints on SUSY contributions coming from other processes (e.g. b > s gamma) are taken into account. Chargino and gluino contributions to photon and Zmediated decays are computed and nonperturbative corrections are considered....
Source: http://arxiv.org/abs/hepph/9907329v1
12
12



by
Albrecht Boettcher; Harold Widom
12
0
0
We present two elementary derivations of the formula for the Toeplitz determinant generated by a pure FisherHartwig singularity.
Source: http://arxiv.org/abs/math/0312198v2
9
9.0



by
Constanze Roedig; Alberto Sesana; Massimo Dotti; Jorge Cuadra; Pau AmaroSeoane; Francesco Haardt
9
0
0
We study the interplay between gas accretion and gravity torques in changing a binary elements and its total angular momentum (L) budget. Especially, we analyse the physical origin of the gravity torques (T_g) and their location within the disc. We analyse 3D SPH simulations of the evolution of initially quasicircular massive black hole binaries (BHBs) residing in the central hollow of massive selfgravitating circumbinary discs. We use different thermodynamics within the cavity and for the...
Source: http://arxiv.org/abs/1202.6063v2
5
5.0



by
Shiro Goto; Satou Kimura; Naoyuki Matsuoka; Tran Thi Phuong
5
0
0
Quasisocle ideals, that is the ideals $I$ of the form $I= Q : \mathfrak{m}^q$ in a Noetherian local ring $(A, \mathfrak{m})$ with the Gorenstein tangent cone $\mathrm{G}(\mathfrak{m}) = \bigoplus_{n \geq 0}{\mathfrak{m}}^n/{\mathfrak{m}}^{n+1}$ are explored, where $q \geq 1$ is an integer and $Q$ is a parameter ideal of $A$ generated by monomials of a system $x_1, x_2, ..., x_d$ of elements in $A$ such that $(x_1, x_2, ..., x_d)$ is a reduction of $\mathfrak{m}$. The questions of when $I$ is...
Source: http://arxiv.org/abs/0710.1387v2
7
7.0



by
P. Balbi; A. Giovannini
7
0
0
Following HERA experiments our interest is focused, in the present paper, on charmonium production in leptonproton collisions. Inelastic J/\psi electroproduction is quite difficult to be measured due to the low rates of events; almost all experimental studies are indeed performed in photoproduction regime. J/\psi resonance is considered as the product of the hadronization of a c \bar{c} pair generated via bosongluon fusion. The leading order contribution to the differential cross section,...
Source: http://arxiv.org/abs/hepph/0212168v1
10
10.0



by
Gleb Arutyunov; Emery Sokatchev
10
0
0
We discuss the perturbative behavior of the 1/2 BPS operators in N=2 SCFT on the example of two very similar quadrilinear composite operators made out of hypermultiplets. An explicit oneloop computation shows that one of them is protected while the other acquires an anomalous dimension. Although both operators are superconformal primaries in the free case, the quantum corrections make the latter become a 1/2 BPS descendant of the Konishi multiplet, while the former remains primary. The...
Source: http://arxiv.org/abs/hepth/0209103v1
8
8.0



by
F. Cianfrani; G. Montani
8
0
0
We perform a canonical quantization of gravity in a secondorder formulation, taking as configuration variables those describing a 4bein, not adapted to the spacetime splitting. We outline how, neither if we fix the Lorentz frame before quantizing, nor if we perform no gauge fixing at all, is invariance under boost transformations affected by the quantization.
Source: http://arxiv.org/abs/0805.2811v1
5
5.0



by
Decio Levi; Christian Scimiterna
5
0
0
We show that one can define through the symmetry approach a procedure to check the linearizability of a difference equation via a point or a discrete ColeHopf transformation. If the equation is linearizable the symmetry provides the linearizing transformation. At the end we present few examples of applications for equations defined on four lattice points.
Source: http://arxiv.org/abs/1302.0154v1